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Please solve this and give full explanation and how we put in this cos please tell me

ARUN KUMAR , 6 Years ago
Grade 12th pass
anser 1 Answers
Aastha Singh

Last Activity: 6 Years ago

Dear student,

from formula:
sin2A = 2 sinA cosA ->equation 1

from question:
2 sinA cosA= sinA
2cosA =sinA/sinA
cos A = ½ ->eqn 2

since,
cos 60 =1/2 ->from theory
cos A = ½ →from eqn 2
A = 60 deg
hope this helps :)

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